I've recently notice my N55 has been performing
quiet sluggishly. Daily driving has been less than
thrilling, the bimmer feels slow when flooring it.
During a couple of track events, on the straight aways
the car doesn't feel like it did before. Boosting
has not been optimal.

Here's what I found when checking up on
my mods - An oily mess on the charge pipe arm
going to the t-body!!! The oil residue was on the
charge pipe, the DME wires, the DME board, on the
t-body -- Immediately, problem found.

oily residue - all around the
charge pipe

started to clean the outside
but u can see the inside is oily - the sensor needs
cleaning

I removed the charge pipe, wiped down
everything, removed the sensor shot it with
some crc cleaner. Clear'd the tune did
a run and was very happy. The N55 boost'd
properly on Map 1 and 2. Huge difference

The CP design using the C-Clip is prone
to leakage as you can see. I would recommend
to you guys out there to do some regular maintenance
and clean ur CP, CP sensor, MAF sensor as well.

I'm not knocking ER's CP, just sharing with you
how it's been holding up.
In the later day i'm going try to add a thin
silicone hose between the CP and t-body.
To help prevent any extreme oily messes.

Any of you have similar experience post up.

And on a side note - to continue on maintenance.
on the list to clean is the intake manifold / walnut shell
blasting. Will post pictures soon.

The CP design that use the C-Clip might be prone to leakage, but at least you actually SEE the mess, I have the Vishnu CP, its certainly 100% sealed but the sensor might be covered with oil... I'll have a look.

Very interested in the intake manifold pics after 50k miles, the n55 is supposed to be a bit better on that subject (supposed better crankcase ventilation system).

Hey hetzle -
i've seen oil build up from the front mount intercooler as well
both n54 and n55, it's common. the build up is most likely from the
turbo - maybe someone can chime in with details.

btw, sorry to hear bout ur botch'd tune install.
read ur post.

Quote:

Originally Posted by Kalud

Thanks for the heads up! I will check mine.

The CP design that use the C-Clip might be prone to leakage, but at least you actually SEE the mess, I have the Vishnu CP, its certainly 100% sealed but the sensor might be covered with oil... I'll have a look.

Very interested in the intake manifold pics after 50k miles, the n55 is supposed to be a bit better on that subject (supposed better crankcase ventilation system).

Diff check - it made a big difference..
the Vishnu CP, with it's silicone hose to the T-body (design)
is a guaranteed seal - only way air will seap through
is if it pops off or u got a leak somewhere else.

I've been wanting to check out the valves - soon enough
i'll post up some pics -

also the n55 valve train - i may have some news and
issues. do you know of any know problems on the boards
from a member?